diff --git a/client.cpp b/client.cpp
index 0849c21554..9f5e0bc669 100644
--- a/client.cpp
+++ b/client.cpp
@@ -477,7 +477,7 @@ QRegion Client::mask() const
     
 void Client::setShapable(bool b)
     {
-    uint tmp = b?1:0;
+    long tmp = b?1:0;
     XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_shapable, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &tmp, 1L);
     }
 
@@ -746,7 +746,7 @@ void Client::setShade( ShadeMode mode )
     if ( isShade()) 
         { // shade_mode == ShadeNormal
         // we're about to shade, texx xcompmgr to prepare
-        uint _shade = 1;
+        long _shade = 1;
         XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_shade, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &_shade, 1L);
         // shade
         int h = height();
@@ -1776,8 +1776,9 @@ void Client::setOpacity(bool translucent, uint opacity)
         if(opacity == opacity_)
             return;
         opacity_ = opacity;
-        XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_opacity, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &opacity, 1L);
-        XChangeProperty(qt_xdisplay(), window(), atoms->net_wm_window_opacity, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &opacity, 1L);
+        long data = opacity; // 32bit XChangeProperty needs long
+        XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_opacity, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &data, 1L);
+        XChangeProperty(qt_xdisplay(), window(), atoms->net_wm_window_opacity, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &data, 1L);
         }
     }
     
@@ -1785,7 +1786,8 @@ void Client::setShadowSize(uint shadowSize)
     {
     // ignoring all individual settings - if we control a window, we control it's shadow
     // TODO somehow handle individual settings for docks (besides custom sizes)
-    XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_shadow, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &shadowSize, 1L);
+    long data = shadowSize;
+    XChangeProperty(qt_xdisplay(), frameId(), atoms->net_wm_window_shadow, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &data, 1L);
     }
         
 void Client::updateOpacity()
@@ -1992,7 +1994,7 @@ uint Client::opacity()
 
 int Client::opacityPercentage()
     {
-    return ((int)100*((double)opacity_/0xffffffff));
+    return int(100*((double)opacity_/0xffffffff));
     }
     
 bool Client::touches(const Client* c)
diff --git a/options.cpp b/options.cpp
index 082af2fa98..aa9b69836a 100644
--- a/options.cpp
+++ b/options.cpp
@@ -173,13 +173,13 @@ unsigned long Options::updateSettings()
     useTranslucency = config->readBoolEntry("UseTranslucency", false);
     config->setGroup( "Translucency");
     translucentActiveWindows = config->readBoolEntry("TranslucentActiveWindows", false);
-    activeWindowOpacity = (config->readNumEntry("ActiveWindowOpacity", 100)/100.0)*0xFFFFFFFF;
+    activeWindowOpacity = uint((config->readNumEntry("ActiveWindowOpacity", 100)/100.0)*0xFFFFFFFF);
     translucentInactiveWindows = config->readBoolEntry("TranslucentInactiveWindows", false);
-    inactiveWindowOpacity = (config->readNumEntry("InactiveWindowOpacity", 100)/100.0)*0xFFFFFFFF;
+    inactiveWindowOpacity = uint((config->readNumEntry("InactiveWindowOpacity", 100)/100.0)*0xFFFFFFFF);
     translucentMovingWindows = config->readBoolEntry("TranslucentMovingWindows", false);
-    movingWindowOpacity = (config->readNumEntry("MovingWindowOpacity", 100)/100.0)*0xFFFFFFFF;
+    movingWindowOpacity = uint((config->readNumEntry("MovingWindowOpacity", 100)/100.0)*0xFFFFFFFF);
     translucentDocks = config->readBoolEntry("TranslucentDocks", false);
-    dockOpacity = (config->readNumEntry("DockOpacity", 100)/100.0)*0xFFFFFFFF;
+    dockOpacity = uint((config->readNumEntry("DockOpacity", 100)/100.0)*0xFFFFFFFF);
     keepAboveAsActive = config->readBoolEntry("TreatKeepAboveAsActive", true);
     //TODO: remove this variable
     useTitleMenuSlider = true;
diff --git a/utils.cpp b/utils.cpp
index e58b1efb11..19d147b9d8 100644
--- a/utils.cpp
+++ b/utils.cpp
@@ -165,7 +165,7 @@ bool KWinSelectionOwner::genericReply( Atom target_P, Atom property_P, Window re
     {
     if( target_P == xa_version )
         {
-        Q_INT32 version[] = { 2, 0 };
+        long version[] = { 2, 0 };
         XChangeProperty( qt_xdisplay(), requestor_P, property_P, XA_INTEGER, 32,
             PropModeReplace, reinterpret_cast< unsigned char* >( &version ), 2 );
         }